CentOS7使用iptables

1、卸载firewalld

yum -y remove firewalld

2、安装iptables

 yum install -y iptables

3、编写iptables规则

# vi /etc/iptables.sh 

#!/bin/sh

#declare variables
IPTABLES=/usr/sbin/iptables
ETHI=eth0
ETHO=eth1

#clear all policy
$IPTABLES -F

#the policies for loopback
$IPTABLES -A INPUT -i lo -j ACCEPT
$IPTABLES -A OUTPUT -o lo -j ACCEPT

#the policies for private network
$IPTABLES -A INPUT -i $ETHI -s 10.173.3.29 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.10.188 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.10.145 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.28.173 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.162.211.124 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.173.11.107 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -s 10.162.208.176 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.3.29 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.10.188 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.10.145 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.28.173 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.162.211.124 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.173.11.107 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.162.208.176 -j ACCEPT

#the policies for monitor
$IPTABLES -A INPUT -i $ETHI -s 10.242.174.13 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -d 10.242.174.13 -j ACCEPT

#for DNS request
$IPTABLES -A INPUT -i $ETHI -p udp -s 10.202.72.118 --sport 53 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p udp -s 10.202.72.116 --sport 53 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -p udp -d 10.202.72.118 --dport 53 -j ACCEPT
$IPTABLES -A OUTPUT -o $ETHO -p udp -d 10.202.72.116 --dport 53 -j ACCEPT

#the policies for public network
$IPTABLES -A OUTPUT -o $ETHO -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p icmp -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 25234 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 80:88 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp --dport 443 -j ACCEPT
$IPTABLES -A INPUT -i $ETHI -p tcp -s 101.36.94.174 --dport 1055 -j ACCEPT

#the logs recode
$IPTABLES -A INPUT -i $ETHI -p tcp -j LOG --log-prefix "IPTABLES TCP-IN: "
$IPTABLES -A INPUT -i $ETHI -p udp -j LOG --log-prefix "IPTABLES UDP-IN: "
$IPTABLES -A OUTPUT -o $ETHO -p tcp -j LOG --log-prefix "IPTABLES TCP-OUT: "
$IPTABLES -A OUTPUT -o $ETHO -p udp -j LOG --log-prefix "IPTABLES UDP-OUT: "

#all the other requests will be drop
$IPTABLES -A INPUT -j DROP
$IPTABLES -A FORWARD -j DROP
$IPTABLES -A OUTPUT -j DROP

# chmod +x /etc/iptables.sh

4、创建iptable日志记录文件

# touch /var/log/iptable.log

# vi /etc/rsyslog.conf    在最后一行添加
kern.warning /var/log/iptables.log

# systemctl restart rsyslog